code: def __init__(self, ranks, rank_in_group, comm):
      super(HaloExchangerAllGather, self).__init__(ranks, rank_in_group)
      # self.comm must be NCCL process_group created with torch.distributed.new_group(ranks=ranks)
      self.comm = comm
  
imports: import torch
  import torch.distributed
  from torch import nn
  import nccl_p2p_cuda
  import peer_memory_cuda
label_desc: Use image node_id 1 to create a new HaloExchangerAllGather object from inherited base classes: HaloExchanger with example: obj = HaloExchangerAllGather(ranks, rank_in_group, comm)